<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>后盾人</title>
  </head>
  <body></body>
  <script>
    let hd = { name: "后盾人" };
    let edu = hd;
    let arr = [hd];
    hd = null;
    edu = null;
    arr[0] = null;
    console.log(arr);
  </script>
</html>
